A. The word is valedictory [val-i-dik-tuh-ree]
-Nick T.
B. The valedictorian made a valedictory speech to the rest of their class.

C.
Source: "valedictory." Dictionary.com Unabridged (v 1.1). Random House, Inc. 12 Jan. 2007. <Dictionary.com http://dictionary.reference.com/browse/valedictory>

val·e·dic·to·ry external image premium.gif external image thinsp.pngexternal image speaker.gif adjective, noun, plural -ries.
–adjective
1.
bidding good-bye; saying farewell: a valedictory speech.
2.
of or pertaining to an occasion of leave-taking: a valedictory ceremony.
–noun
3.
an address or oration delivered at the commencement exercises of a college or school on behalf of the graduating class.
4.
any farewell address or oration.
Dan W.

E. Synonyms:
exaugural, farewell, valediction, valedictory address (rhymezone.com)
Antonyms:
welcoming (answers.com)
- Amber Z.

G. In the movie Legally Blonde, Elle (Reese Witherspoon) is the valedictorian at Harvard Law School. She gives a valedictory speech to her fellow classmates as they bid farwell and start their lives in the real world. * ashley c